Watchmaker s tool



(No Model.)

A. H. FLEMING. WATGHMAKBRS T001.. N. 525,810.

Patented Sept. l1, 1894.

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NITED STATES c PATENT Prien.

ALLISON HOWARD FLEMING, OF FAIRMONT, WEST VIRGINIA.

WATCH MAKERS TOOL.

SPECIFICATION forming part of Letters Patent No. 525,810, datedSeptember 11, 1894.

I Application filed April 12, 1894. Serial No. 507,287. (No modelJ Toall whom, it may concern:

Be it known that I, ALLIsoN HOWARD FLEM- ING, a citizen of the UnitedStates, residing at Fairmont, in the county of Marion and State of WestVirginia, have invented a new and useful Watchmakers Tool, of which thefollowing is a speciiication.

My invention relates to a centering and drilling tool for watchmakerslathes; and has for its objects to provide a simple, inexpensive, andefficient device for automatically centering and guiding a drilling toolfor drilling center sockets in staffs and pinions of watch mechanism; toprovide means for advancing and retracting the drill with facility; andto provide means for adjusting and replacing the various parts of thetool for different kinds of Work.

Other objects and advantages of the invention will appear in thefollowing description and the novel features thereof will beparticularly pointed out in the claim.

In the drawingsz-Figure 1 is a perspective view of a centering anddrilling tool embodying my invention applied in the operative positionto a lathe of the construction known as American watchmakers lathe. Fig.2 is a longitudinal central section of the tool. Fig. 3 is a side viewof the centering and drilling tool showing the centering chuck detached.

Similar numerals of reference indicate corresponding parts in all thefigures of the drawings.

1 designates a lathe, of which 2 is the drillchuck carried by the shaft3, which is mounted upon the standard ,-1, and 5 the tail-chuck mountedslidably upon the guide 6 and provided with the usual set-screw 7.

The numeral 8 represents a stad, which is secured in the drill-chuck inposition for operation.

9 represents the improved centering and drilling tool comprisingessentially the cylindrical casing 10 provided at its rear end with acenter socket 1l for the reception of the center cone 12 on theextremity of the tailchuck. Within this casing is fitted slidably thestem 13, which passes through an annular block 14 fitting in an enlargedportion of the bore of the cylinder and provided with a threadedtransverse aperture 14a, which receives the inner end of a set-screw 15.This set-screw extends through alongitudinal slot 16 in the side of thecasing and is carried by a holding and operating sleeve 17 which isiitted slidably upon the exterior of the cylinder, and is limited in itslongitudinal movement by the stop-shoulders 1S and 19 locatedrespectively near the front and rear ends of the cylinder and is heldfrom rotary movement by the contact of the shank of the set-screw withthe sides of the longitudinal slot in the cylinder. In the constructionillustrated in the drawings, said cylinder 10 comprises a tubular shell10a, in the ends of which are litted tubular plugs 10b, said plugsterminating short of the center of the shell in order to provide anenlarged bore to receive the annular block 14. The shoulders 18 and 19are integral, respectively, with these tubular plugs 10", and in theregistering bores of the latter is tted the stem 13, the plug whichcarries the shoulder 18 being extended beyond such shoulder to support acentering chuck, hereinafter described.

The stem 13 is provided at its front end with a drill-bit socket 20, inwhich fits the bit 2l, and the front end of the cylinder beyond thefront stop-shoulder 18 is reduced to form a cylindrical projection 22upon which is removably fitted the centering chuck 23. The bore of thiscentering chuck is enlarged at its rear end to receive the projection onthe end of the cylinder, and is reduced at its front end to a sizecorresponding with the diameter of the drill-bit which is in use. Suchreduction of the front portion of thebore of the centering chuck isaccomplished by means of a rounded annular shoulder 24., clearly shownin the sectional view, Fig. 2. The portion of the bore of the centeringchuck, beyond said annular reducing shoulder, is dared, as shown at 25,for the reception of the extremity of the staff or pinion to be bored ordrilled.

In operation, the center socket at the rear end of the cylinder of thecentering and drilling tool is fitted upon the centering cone of thetail-chuck of the lathe, and the flared terminal of the bore of thecentering chuck is itted upon the extremity of the staff or pinion to bedrilled, the drill being retracted within said centering-chuck by thearrangement of the holding and operating sleeve in contact with the rearstop-shoulder 19. Said holding IOO and operating sleeve is then advancedby the operator to cause the drill-bit to press with the desired forceupon the extremity of the staff or pinion.

It will be seen that by means of the adjustable block through which thestem passes said stern may be adjusted longitudinally through the blockand hence with relation to the holding and operating sleeve to vary theamount of projection of the drill-bit and to accommodate the length ofsuch bit. Furthermore, the centeringchuck being removable from the endof the cylinder may be replaced as the bit is changed, whereby theguiding portion of its bore may agree with the particular bit in use toprevent Vibration of the front or operating end of said bit.

It will be understood that various changes in the form, proportion, andthe minor details of construction may be resorted to Without departingfrom the spirit of the invention or sacriciug any of the advantagesthereof.

Having described my invention, what I claim is- The combination of acylinder, a stem slidably fitted therein and provided with a socket forthe drill tool, a block slidably fitted in the cylinder and providedwith an opening through which said stem extends,a set-screw to securethe stem atthe desired pointin the block, a slot being formed in thecylinder through which the set-screw extends, a sleeve slidably ittedupon the cylinder and engaged by the set-screw, and a centering capremovably fltted upon the reduced front end of the cylinder,substantially as specified.

In testimony that I claim the foregoing as my own I have hereto aixed mysignature in the presence of two Witnesses.

A. HOWARD FLEMING.

Vitnesses:

R. C. DUNNINGTON, W. H. KELLEY.

